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13D9

 
    
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The 13D9 is a mystery valve in that no reference to it can be found in the available literature or on the internet. However, it is widely reported to be a special quality ECC81 or M8162.
The getter ring support is in the form of a bright U-channel "strut" that extends right across both micas and a fair way above the upper one. Quite different to the Brimar 13D9 in construction.
The anodes are small boxes with extended side flanges.
Thanks to R J Sutherland for the excellent images and information.
The thin glass tube envelope is 21 mm in diameter and excluding the B9A base pins, is 47 mm long.
References: R J Sutherland.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
a(2)
g1(2)
k(2)
h
h
a
g1
k
hct

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
170
-1
8.5
11k
5.9
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 24, 2016.
shape:thin.glass.tube construction:all.glass type:double.triode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.a(2) pin:2.g1(2) pin:3.k(2) pin:4.h pin:5.h pin:6.a pin:7.g1 pin:8.k pin:9.hct
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